Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 31, Issue 26, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ab1469
Keywords
high pressure; multiferroic BiFeO3; structural transformation; insulator-metal transition
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Funding
- National Natural Science Foundation of China [11475212, 11505211, 61204008]
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The pressure-induced phase-transition sequences and structural evolution across the insulator- metal transition (IMT) in multiferroic BiFeO3 still remain unclear. Here we use a combination of high-pressure XRD, XAFS experiment and first principle calculation to investigate the pressure-derived structural transformations and structure-related properties in bulk and nanoscale BiFeO3 up to 55 GPa. A new Imma structure of BiFeO3 has been discovered in the pressure range of 48-52 GPa, which presents ferromagnetic (FM) metallic properties and therefore plays a key role in the IMT. Local structure study reveals that the Bi3+ cation gradually shifts toward the centrosymmetric position in BiO12 cluster during IMT. Besides, the detailed structural information of post-perovskite Cmcm phase has also been determined and thus the complete phase sequence up to 60 GPa is obtained. Our research provides a structural origin of the IMT and a new way to understand the FM release in BiFeO3 system.
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